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In Reply to: RE: Any octal equivalent of 6dj8? posted by Triode_Kingdom on May 01, 2017 at 07:40:36
I got nothing against the mini tube but it is just not aesthetically pleasing as a 6sn7. Not to mention that i prefer the audio performance of the sn7.
I would not use NFB from the output trans secondary but plate to plate fb from the kt to the driver tube.
I have a small headphone amp by Schiit called the Vali 2, It uses all varieties of the 6dj8/6922 family. Some of the Head-Fi forum guys found a 9 pin adapter for the single 6dj8 to take a 6SN7. This is my present tube for my Vali 2. Its a Sylvania 6SN7-W. This is a hybrid amp and the tube is used in sections for each channel of the preamp. That is a Schiit Modi Multiunit DAC under the amp. ICs, USB and Apple Mini are all Wywires Silver or better
There's nothing wrong with a few dB of global feedback. That's all you'll need for good results with the UL output. I think the 'SN7 will have sufficient gain if you do that. If you're intent on using plate-to-plate FB, I'd consider Eli's suggestion.
Buy Chinese. Bury freedom.
"I would not use NFB from the output trans secondary but plate to plate fb from the kt to the driver tube."
That kind of short loop NFB has a reputation for working best, when the driver is high impedance. The 6AC7 Octal pentode (gm = 9 mA./V.), with regulated g2 B+ and an unbypassed cathode bias resistor might meet your needs.
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